We present an open-loop (bang-bang) scheme which drives an open two-levelquantum system to any target state, while maintaining quantum coherencethroughout the process. The control is illustrated by a realistic simulationfor both adiabatic and thermal decoherence. In the thermal decoherence regime,the control achieved by the proposed scheme is qualitatively similar, at theensemble level, to the control realized by the quantum feedback scheme of Wang,Wiseman, and Milburn [Phys. Rev. A 64, #063810 (2001)] for the spontaneousemission of a two-level atom. The performance of the open-loop scheme comparesfavorably against the quantum feedback scheme with respect to robustness,target fidelity and transition times.
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机译：我们提出一种开环（bang-bang）方案，该方案将一个开放的两级量子系统驱动到任何目标状态，同时在整个过程中保持量子相干性。通过绝热和热退相干的逼真的仿真来说明该控制。在热退相干状态下，在整体层次上，所提出的方案所实现的控制在质量上与Wang，Wiseman和Milburn的量子反馈方案所实现的控制相似。 Rev. A 64，＃063810（2001）]，用于自发发射两级原子。就鲁棒性，目标保真度和过渡时间而言，开环方案的性能可与量子反馈方案进行比较。
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